Flue-cutter.



J. OASAGRANDE.

PLUB CUTTER.

APPLICATION FILED AUG. 11 1910.

Patented June 27,1911.

2 SHEETS-SHEET 1.

J. CASAGRANDE.

FLUE CUTTER. 3 APPLICATION IILED,AUG. 11, 1910-.

996,310, Y Patented June 27, 1911.

A m a ss an FTCE.

JOHN CASAGRANDE, OF DENVER, COLORADO, ASSIGNOR OF ONE-HALF TO HER-MANNJ. GAMMETER, OF DENVER, COLORADO.

FLUE-CUTTER.

Specification of Letters Patent.

Patented June 27, 1911.

Application filed. August 11, 1910. Serial No. 576,672.

To all whom it may concern:

-Be it known that I, JOHN CASAGRANDE, a subject of the Republic ofSwitzerland, residing in the city and county of Denver and State ofColorado, have invented certain new and useful Improvements inFlue-Cutters; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to the letters and figuresof reference marked thereon, which form a part of this specification.

My invention relates to improvements in means for cutting out boilerfines, and consists of a tool whose cutting extremity is adapted toenter the fine, the tool being bodily rotated by suitable power, whilean independent movement is imparted to one member of the device, beingthat which carries the knife or cutter, whereby the cutting point oredge of the latter is gradually fed outwardly to perform the cuttingfunction as the cutter extremity of the tool is rotated bodily. Fromthis it will be understood that the tool consists of two members movableindependently of each other yet connected to rotate bodily in unison.

Generally speaking the device consists of a sleeve in which is inserteda cylindrical shank having a spiral slot extending there through andextending a portion of the distance therearound. This shank is connectedwith the sleeve by passing a pin through the spiral slot of the shankand straight slots formed in opposite sides of the sleeve. The sleeve isexteriorly threaded to receive a feed nut which is interiorly threadedto correspond with the exterior sleeve threads. This nut is providedwith an interior circumferential groove into which the protrudingextremities of the pin extend. The nut is provided with perforationsintersecting the interior groove, whereby the pin may be dropped intoplace. Then as the nut is turned on the sleeve, the pin will be carriedforwardly with the nut and will be forced through the spiral groove ofthe shank and straight slots of the sleeve, thus causing a partialrotary movement of one of these members with respect to the other,whereby the knife holder carried by the sleeve, by virtue of itsconnection with the protruding head of a pin eccentrically mounted inthe shank, is fed laterally in one direction, while the tool is bodilyrotated for cutting purposes, the feeding movement of the knife beingcaused to harmonize with the rapidity of its cutting action. The pinwhich is eccentrically mounted in the shank, has a rectangular headwhich fits into a straight groove formed in the knife holder andextending at right angles to the direction of the feeding movement ofthe blade holder, the construction and arrangement of the parts beingsuch that a partial independent rotary movement of the sleeve or shankwith respect to the other will carry the blade and its holder laterallya sufficient distance to perform the flue-cutting function.

Having briefly outlined my improved construction, I will proceed todescribe the same in detail, reference being made to the accompanyingdrawing in which is illustrated an embodiment thereof.

In this drawing: Figure 1 is an elevation of my improved tool, the samebeing illustrated in detail. Fig. 2 is a sectional view taken throughthe tool and the crown sheet of the boiler, the cutting extremity of thetool being inserted in a flue for cutting purposes. Fig. 3 is asectional View of the sleeve member of the tool shown in detail. Fig. 4

is an end elevation of the tool looking in the direction of arrow 4,Fig. 1. Fig. 5 is a cross section of the tool taken on the line 55 Fig.1, looking toward the left or in the direction of the arrow. Fig. 6 is aview similar to Fig. 2 showing a slightly modified form of construction.Fig. 7 is an end elevation of the tool looking in the direction of arrow7, Fig. 1. In this view the feed nut does not appear. Fig. 8 illustratesthe cutting device properly shown in two different positions. Fig. 9 isa detail view of the pin :which, when the parts are assembled, iseccentrically mounted in the shank and en gages the knife holder toimpart the lateral :movement thereto. view in detail of the feed nut.can end elevation of the knife holder shown .in detail, being a viewlooking in the direction of arrow 11, Fig. 12. Fig. 12 is a sectiontaken on the line 1212 Fig. 11. Fig. '13 is an elevation looking in thedirection Fig. 10 is a sectional Fig. 11 is of arrow 13 Fig. 12. Figs.1a, 15 and 16 are cross sectional views taken on line 14.15

Fig. 2, illustrating the action of the eccentrically mounted pin on theknife holder during the operation of the device.

, The same reference characters indicate the same parts in all theviews.

Let the numeral 5 designate a sleeve having straight slots 6 formed inits opposite sides. A cylindrical shank 7 is adapted to enter the sleeveand is connected therewith to permit independent rotary movement bymeans of a set screw 8 passed through registering perforations formed ina lock nut 9 and the sleeve, the perforation in the sleeve beingdesignated by the numeral 10 and that in the lock nut by the numeral 12.This lock nut abuts against the main feed nut 13 which is threaded onthe exteriorly threaded portion 1a of the sleeve. A in 15 is passedthrough a spiral slot 16 formed through the shank 7 and through thestraight slots 6 formed in the sleeve. The extremities of this pin enteran exteriorly circumferential groove 17 formed in the nut, the pin beinginserted through a perforation 18 formed in the nut and extending fromthe outside of the latter into the groove. By bringing this perforationinto register with the straight slots 6 of the sleeve, the spiral slot16 being in register with the said perforation and with the straightslots at a single point, the pin may be inserted as will be readilyunderstood. Then as the feed nut 13 is rotated on the sleeve, the pinwill be moved forwardly in the straight slots 6 and the spiral 16 toharmonize with the forward travel of the nut, thus imparting independentrotary movement to the sleeve independently of the shank. The forwardextremity of this sleeve is adapted to enter a flue 19 where the latterpasses through the crown sheet 20'of the boiler. The sleeve isinteriorly reinforced as shown at 21 and in this re inforced portion isformed a rectangular opening 22 adapted to receive a holder 23 for theknife or cutter 24 which is inserted in a rectangular opening 25 formedin the holder and locked in place by a set screw or bolt 26, which ispassed through a slotted opening 27 formed in a web or partition 28located adjacent the blade holder opening v22. The cutting blade 24 islonger than the holder and its cutting extremity 29 protrudes therefromfor flue-cutting purposes. The knife holder is free to travel laterallyin its opening 22, and this lateral movement is imparted by a pin 30which is eccentrically mounted in a perforation 31 formed in the innerextremity of the shank, the head 32 of the pin, which is rectangular inshape, protruding from the inner extremity of the shank and entering aslot 33 formed in the adjacent face of the blade holder, and in whichthe head of the pin fits closely. The shank of this pin is cylindricalin shape and fits loosely in the perforation of the shank. From thisconstruction it will be understood that if either the shank or thesleeve be given rotary movement independently of or with respect tothe'other, lateral movement will be imparted to the knife holder in theopening 22.

Now if it is desired to cut a boiler flue, the tool in the formillustrated in Fig. 1, will be applied to the flue by inserting theinner extremity of the sleeve into the flue 19, until a circumferentialshoulder 34' formed on the sleeve abuts against the outer extremity 35of the flue. The tool will then be rotated bodily through theinstrumentality of an operating device or motor of any suitablecharacter, the extremity 36 of the shank adjacent the threaded end ofthe sleeve, being formed polygonal in cross section to fit the chuck ofthe engine or motor. As the tool begins to rotate, it is assumed thatthe cutting extremity 29 of the knife will be in such position as toengage the innersurface of the flue and will therefore begin to cut thelatter. Yet if no provision were made for feeding the blade holderlaterally to keep pace with the cutting action of the knife extremity,the latter would of course be unavailable for the proper performance ofits function. However, as the tool is rotated bodily, the feed nut 13which is provided with recesses 37 for a spanner wrench, is turned onthe threaded portion 14: of the shank, whereby it is caused to travelforwardly or toward the end of the flue to be cut. During this forwardtravel of the nut, the pin 15 is also carried forwardly to keep pacewith the travel of the nut, and as the pin moves through the straightslots 6 and the spiral slot 16, rotary movement is imparted to one ofthese members with respect to the other, that is to say, independentlyof the other, and by virtue of the connection between the pin 30 whichis 'eccentrically mounted in the forward extremity of the shank asaforesaid, and the knife holder, lateral movement is imparted to thelatter to keep pace with the cutting action of the knife during thebodily rotary action of the tool, and the operation is continued untilthe flue is cut through, as shown at 38 (see Fig. 2.)

In the form of construction shown in Fig. 6 the tool is adapted for usein cutting a larger flue and to this end an auxiliary sleeve 39 isapplied to the portion of the main sleeve 5 which enters the flue, theextremity of the auxiliary sleeve being upset as shown at 10 to engagethe upset end 35 of the flue, the upset end of the auxiliary sleevebeing interposed between the shoulder 34 of the main sleeve and the endof the flue to be out. In this event the knife holder and blade shouldbe correspondingly increased in length in order that the lateralmovement imparted thereto may be suflicient to sever the larger flue.Attention is called to the fact that in this form of construction theauxiliary sleeve is provided with an opening 41 into which the knifeholder 23 protrudes, whereby the auxiliary sleeve is keyed to the sleeve5 and caused to rotate therewith during the operation of the device.

The nut 13 is provided with an annular groove 42 formed in one facethereof and adapted to receive a ring 43 having perforations throughwhich the protruding extremities of the pin 15 pass. This ring forms asort of supporting guide or holder for the pin 15 during the operationof the nut for the purpose of moving the pin in the slots of the sleeveand shank for the purpose heretofore explained.

Having thus described my invention, what I claim is:

1. A flue cutter composed of a sleeve, a shank within the sleeve, thesleeve having slots parallel with the axis of the tool, the shank havinga spirally arranged slot pin passed through the slots of the sleeve andshank, means for imparting rotary movement to the tool as a whole, meansfor moving the pin in the slots of the two members for impartingindependent movement to one member, a cutter device carried by onemember, and a connection between the cutter device of the other memberwhereby as the independent movement is imparted to one member the cutterdevice is moved laterally, for the purpose set forth.

2. A tool of the class described composed of a sleeve, a shank withinthe sleeve, the two members being connected to rotate together and tohave independent rotary movement, one of the said members having astraight slot and the other member a spiral slot, a pin passed throughthe slots of both members, a nut threaded on the sleeve and having acircumferential groove into which the extremities of the pin protrude,whereby as the nut is caused to travel on the sleeve the pin is moved inthe slots of both members, a cutter device laterally slidable in anopening formed in one member, a pin eccentrically mounted in the othermember and engaging an elongated recess formed in the cutter device.

3. A tool of the class described composed. of a sleeve, a shank withinthe sleeve, the two members being connected to rotate bodily and also tohave independent rotary movement, the sleeve member having oppositelylocated straight slots, the shank member having a spiral slot, a pinpassed through the slots of both members and having protrudingextremities, a nut threaded on the sleeve and having a circumferentialgroove into which the protruding extremities of the pin project, acutter device slidably mounted in an opening formed in the sleeve memberadjacent the inner extremity of the shank member, a pin eccentricallymounted in the shank member and engaging an elongated recess formed inthe adjacent face of the cutter device, substantially as described.

4.. A fine cutter composed of a sleeve, a shank therein, the two membersbeing connected to rotate together and to have a limited degree ofindependent rotary movement, a cutter device carried by one of themembers, a nut threaded on the sleeve, and means carried by the nut andengaging the shank, whereby as the nut is rotated on the sleeve the saidmeans is simultaneously caused to move longitudinally of the sleeve andimpart a rotary movement to the shank and a lateral movement to thecutter device, substantially as described.

5. A flue cutter composed of a sleeve, a shank therein, the two membersbeing connected to rotate together and to have a limited degree ofindependent rotary movement, one of the said members having a spiralslot, and the other member having a straight slot, and a pin passedthrough the slots of both members, whereby as the pin is moved onemember is rotated independently of the other, means for rotating thetool bodily, cutting device carried by one member of the tool, and aconnection between the said device and the other member of the tool,whereby the cutting device is moved laterally for cutting purposes bythe independent rotary movement of one of said members, substan tiallyas described.

6. A flue cutter composed of two members, coaxially mounted andconnected to rotate together and to have a limited degree of independent movement, one member having a spiral slot, and the other astraight slot, means passed through the slots of both members, wherebyas the said means is moved, one member is rotated independently of theother, means for rotating the tool bodily, a cutting device carried byone member, and a connection between the said device and the othermember, to impart lateral movement to the cutting device during theindependent movementof one of the said members, substantially asdescribed.

In testimony whereof I afiix my signature in presence of two witnesses.

JOHN CASAGRANDE.

Witnesses HORTENSE UHLRroH, F. E. BOWEN.

Copies of this patent may be obtained for five cents each, by addressingthe Washington, D. G.

Commissioner of Patents,

